HIGHLEAD GC20688 Series, Instruction Manual And Parts List, Page: 19 / 62

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32) Adjusting the thread trimming timing
The center of the pin 1, the center of the reference
hole 3 and the center of the roller 4 of the driving knife
arm should be in a straight line when the thread take-up
lever is at the highest position. (The white point on the
pulley and the point on the belt cover are in a straight
line.)
(1) Turn the machine pulley until the white point on
the pulley and the point on the belt cover are in a straight
line.
(2) Overturn the arm.
(3) Loosen the three bolts 5
(4) Turn the thread trimmer cam 2 to adjust the position of the thread trimmer cam 2 so that the center of the
pin 1, the center of the reference hole 3 and the center of the roller 4 of the driving knife arm are in a straight
line.
(5) Tighten the bolts 5.
33) Safety clutch
The standard safety clutch 2 in the lower
toothed belt wheel protects the hook from being
displaced or damaged in case of thread jamming
in the hook path. When the hook is blocked, the
safety clutch 2 must come out.
(1) Set free blocked hook.
(2) Stick a pin in drill-hole 1 of the outer
clutch disc.
(3) Turn the pulley until the pin can be
stuck in the drill-holes of both clutch parts.
(4) Turn the pulley forwards and backwards until the hook is freely movable again.
(5) Pull out pin.
(6) Hold down hook and turn the pulley until safety clutch 2 engages.
Adjust transmittable torque
Standard checking
The supplier by means of a torque spanner should adjust the torque transmittable from safety clutch 4.
(1) Loosen counter-nuts 3.
(2) Adjust torque